| /* |
| * (C) Copyright 2013 |
| * David Feng <fenghua@phytium.com.cn> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <asm-offsets.h> |
| #include <config.h> |
| #include <version.h> |
| #include <linux/linkage.h> |
| #include <asm/macro.h> |
| |
| ENTRY(armv8_switch_to_el2) |
| switch_el x0, 1f, 0f, 0f |
| 0: ret |
| 1: |
| mov x0, #0x5b1 /* Non-secure EL0/EL1 | HVC | 64bit EL2 */ |
| msr scr_el3, x0 |
| msr cptr_el3, xzr /* Disable coprocessor traps to EL3 */ |
| mov x0, #0x33ff |
| msr cptr_el2, x0 /* Disable coprocessor traps to EL2 */ |
| |
| /* Initialize SCTLR_EL2 */ |
| msr sctlr_el2, xzr |
| |
| /* Return to the EL2_SP2 mode from EL3 */ |
| mov x0, sp |
| msr sp_el2, x0 /* Migrate SP */ |
| mrs x0, vbar_el3 |
| msr vbar_el2, x0 /* Migrate VBAR */ |
| mov x0, #0x3c9 |
| msr spsr_el3, x0 /* EL2_SP2 | D | A | I | F */ |
| msr elr_el3, lr |
| eret |
| ENDPROC(armv8_switch_to_el2) |
| |
| ENTRY(armv8_switch_to_el1) |
| switch_el x0, 0f, 1f, 0f |
| 0: ret |
| 1: |
| /* Initialize Generic Timers */ |
| mrs x0, cnthctl_el2 |
| orr x0, x0, #0x3 /* Enable EL1 access to timers */ |
| msr cnthctl_el2, x0 |
| msr cntvoff_el2, xzr |
| mrs x0, cntkctl_el1 |
| orr x0, x0, #0x3 /* Enable EL0 access to timers */ |
| msr cntkctl_el1, x0 |
| |
| /* Initilize MPID/MPIDR registers */ |
| mrs x0, midr_el1 |
| mrs x1, mpidr_el1 |
| msr vpidr_el2, x0 |
| msr vmpidr_el2, x1 |
| |
| /* Disable coprocessor traps */ |
| mov x0, #0x33ff |
| msr cptr_el2, x0 /* Disable coprocessor traps to EL2 */ |
| msr hstr_el2, xzr /* Disable coprocessor traps to EL2 */ |
| mov x0, #3 << 20 |
| msr cpacr_el1, x0 /* Enable FP/SIMD at EL1 */ |
| |
| /* Initialize HCR_EL2 */ |
| mov x0, #(1 << 31) /* 64bit EL1 */ |
| orr x0, x0, #(1 << 29) /* Disable HVC */ |
| msr hcr_el2, x0 |
| |
| /* SCTLR_EL1 initialization */ |
| mov x0, #0x0800 |
| movk x0, #0x30d0, lsl #16 |
| msr sctlr_el1, x0 |
| |
| /* Return to the EL1_SP1 mode from EL2 */ |
| mov x0, sp |
| msr sp_el1, x0 /* Migrate SP */ |
| mrs x0, vbar_el2 |
| msr vbar_el1, x0 /* Migrate VBAR */ |
| mov x0, #0x3c5 |
| msr spsr_el2, x0 /* EL1_SP1 | D | A | I | F */ |
| msr elr_el2, lr |
| eret |
| ENDPROC(armv8_switch_to_el1) |